If you kept changing the way people saw the world, you ended up changing the way you saw yourself.

He'd been an angel once. He hadn't meant to Fall. He'd just hung around with the wrong people.

No! Please! I'll tell you whatever you want to know!" the man yelled. "Really?" said Vimes. "What's the orbital velocity of the moon?" "What?" "Oh, you'd like something simpler?

There is no doubt that being human is incredibly difficult and cannot be mastered in one lifetime.

One day I'll work out what it is you are saying, my lad, and then you'll be in trouble.

Just because someone's a member of an ethnic minority doesn't mean they're not a nasty small-minded little jerk [...]

"It would seem that you have no useful skill or talent whatsoever" he said. "Have you thought of going into teaching?"